[TPIN] Air pressure injury?

[Stan Chappell]

I'm a come-back amateur player, been playing again for about 4-5 years after 
25 years off the horn.  Things have been going pretty well but I've recently 
developed a problem.  Occassionally when I'm playing a high note I get this 
sharp pain in the soft area below my right ear and behind my jaw.  It feels 
like something gives there from the air pressure.  I'm playing in a 
community theatre musical pit band right now and it happened about 3/4 way 
through the show last night.  I continued to play but it continued to bother 
me, and I'm somewhat concerned about playing again tonight.  What's this 
about?  Has anybody experienced this and have any advice?  Thanks.

Stan